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1
Which process changes a liquid into a gas at the surface, even at room temperature?
A
Melting
B
Condensation
C
Boiling
D
Evaporation
2
What happens to the particles of a liquid when it evaporates?
A
They gain energy and escape into the air.
B
They change into a different substance.
C
They slow down and form drops.
D
They lose energy and become a solid.
3
During boiling, where does the change from liquid to gas happen?
A
Only at the sides
B
Throughout the liquid
C
Only at the bottom
D
Only at the surface
4
Which of these is an example of condensation?
A
Water droplets forming on a cold glass
B
Ice melting into water
C
A puddle drying up in the sun
D
Water boiling in a kettle
5
What happens to the energy of gas particles when they condense into a liquid?
A
They gain energy.
B
They keep the same energy.
C
They double their energy.
D
They lose energy.